She supposed that speculation from really piddly data would be a poor answer. She'd worked through the possibilities over and over in her mind since she first read that Muggle information passed from one friend to another, copied into a journal. The loss of that data had been awful, but she'd gotten some important information first.
"Outside sources," she informed Nicky, very seriously. "Muggles. You were Muggleborn, too, right? You know how much they know about vaccines. Those shots they gave us as kids, right?"